2UNIT IDENTIFICATIONTroubleshooting Charts for Air Conditioners and Heat Pumps areprovided in the appendix at back of this manual. They enable theservice technician to use a systematic approach to locating thecause of a problem and correcting system malfunctions.This section explains how to obtain the model and serial numberfrom unit rating plate. These numbers are needed to service andrepair the Puronr and R--22 air conditioner or heat pump. Modeland serial numbers can be found on unit rating plate.AIR CONDITIONER AND HEAT PUMP MODEL NUMBER NOMENCLATURE1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 162 4 A B A 3 3 6 A 0 0 3 0 0 0 0Series Family Tier MajorSeries SEER CoolingCapacity (Tons) Variations Open Open Voltage MinorSeries Packaging PartsIdentification Open24 = AC25 = HPA = A/CH = HPB = Base / ComfortC = Comfort /PerformanceP = PerformanceN = InfinityA,B = PuronR,S = R223 = 13 SEER5 = 15 SEER6 = 16 SEER8 = 18 SEER1 = 21 SEER7 = 17 SEER18 = 1-- 1/224 = 230 = 2-- 1/236 = 342 = 3-- 1/248 = 460 = 5A = StandardC = CoastalF = Full FeaturedG = Dense GrillL = Louvers0 = NotDefined0 = NotDefined1 = 575-- 33 = 208/230-- 15 = 208/230-- 36 = 460-- 37 = 230-- 1-- 509 = 400-- 3-- 500 =InitialSeries0 = Domestic1 = Import0 = Recip.1 = Scroll2 = StagedRecip.3 = StagedScroll4 = OtherCompr.0 = NotDefinedSERIAL NUMBER NOMENCLATURE01 06Week of ManufactureYear of Manufacture00001Serial NumberEManufacturing SiteE = Collierville TNX = Monterey Mexico